Warm air furnace



April 4, 1939. E. l DAiL 2,153,413

WARM AIR FURNACE Filed July 6, 19-36 FIGZ. 2

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ERNEST I-I J XK wm mmmkuz A TTQRNE YS Patented Apr. 4, 1939 UNITED STATES PATENT OFFICE WARM AIR FURNACE poration of Michigan Application July 6, 1936, Serial No. 89,201

6 Claims.

The invention relates to warm air heating furnaces of that type in which the air is mechanically propelled both through the heater and to the various points of distribution. It is the object of the invention to obtain a greater degree of efficiency and other advantages. To this end the invention consists in the construction as hereinafter set forth.

In the drawing:

Figure 1 is a vertical section through the jacket on the line l--l of Figure 2 showing the heater in elevation;

Figure 2 is a horizontal section on line 2-2 of Figure 1;

Figure 3 is a view similar to a portion of Figure 1 showing a slightly modified construction;

Figure 4 is a horizontal section showing another modification.

My improved furnace is of that type in which the outer jacket is of rectangular form and which encloses heating elements also of rectangular construction. Among the advantages. of this type are: first, that such a furnace forms a more pleasing appearance when located in a furnished room; second, that it can be more economically manufactured.

The construction forming the subject matter of the present application adds to these advantages, that of greater efiiciency.

In detail, A is the furnace proper which is of substantially rectangular construction provided near its upper end with sides B slightly inclined from the perpendicular and with a top C slightly pitched downward on opposite sides of a central ridge. The upper portion of this casing forms a combustion chamber from which the gaseous products of combustion pass outward through a plurality of conduits D into the upper ends of rectangular radiators E. The conduits D are formed in two sections D, D respectively fixedly attached to the sides B of the casing A and to the radiators E and detachably connected to each other by the bolted flanges D The radiators are supported by these conduits and also by brace connections F which connect their lower ends to the casing A. Surrounding the furnace A and radiators E is a jacket G of rectangular form and of dimensions such as to form air spaces around the heated surfaces. Within this jacket and mounted on the top of the furnace casing A is a fan H which draws the heated air from the upper portion of the jacket and propels it through suitable conduits (not shown) to the various points of distribution.

Usually the air to be heated is introduced into the jacket at the lower end thereof and is heated as it passes upward past the furnace casing and the radiators. However, the temperature of the external surface of the radiators is generally considerably lower than that of the furnace casing which latter is subjected to the direct heat of combustion. Consequently, there is a variation in the degree of heat which is communicated to different portions of the ascending air currents. With my improved construction I change the cir- 0 culation through the jacket by admitting the air at the top thereof and first passing it downward in contact with the outer surfaces of the radiators and then upward between the radiators and the heating furnace to impart additional heat there- 15 to. This is accomplished by arranging a bafile which extends vertically in the plane of the inner face of each radiator E from the top thereof to the top of the jacket and also at the front and rear of the radiator to the adjacent walls of the jacket. At the bottom this baffle terminates to form an air passage between the chamber outside of the baffie and that inside, thereby permitting the air which flows downward through the outer chamber to turn and flow upward in M the inner chamber. As shown in Figure 1, I is the bafile which extends from front to rear of the jacket above the radiator E and downward between the front and rear walls of said radiator and the parallel walls of the jacket. The plane m of this baffle is preferably that of the inner wall of the radiator, but in its lower portion the baffle is inclined outward at I over the smoke pipe 8 and then downward at I substantially in the plane of the outer wall of the radiator. If desired, 15 an air washer J may be located in the lower portion of the chamber outside of the baflleor in that portion between the portion I of the baflle and the side wall of the jacket. An alternative construction is shown in Figure 3, where a dry 0 filter K is located in inclined position between the baffle I and the side wall of the jacket. In each construction the air enters through an opening L in the side wall of the jacket which is arranged above the top of the radiator. Thus, the cold air 5 which is drawn by the suction of the fan H through this opening will first pass downward outside of the bafile I but in contact with the top, front, rear and outer side wall of the radiator, absorbing heat from such surfaces. It then passes below the baffle to the inner side thereof and upward in contact with the outer surface of the furnace casing A and also the inner surface of the radiator E until finally is drawn through the suction port of the fan and propelled outward. It will be noted that with this construction the coldest air comes first into contact with the secondary heating surfaces so as to extract the greatest amount of heat therefrom and later the partly heated air comes in contact with the primary heating surfaces to absorb additional heat. This makes for efficiency. It also produces a more uniform heating of the air as there is less difference in temperature between different portions of the inner chamber for the air than there is between such portions and the outer side wall of the jacket.

A modified construction is shown in Figure 4 in which there is a single radiator E, this being located at the rear of the casing for the furnace proper and between the same and the rear wall of the jacket. The construction is, however, otherwise substantially the same as that already described. It will be understood that the products of combustion after passing from, the furnace proper into the radiators and downward therethrough, pass outward through suitable conduits S (shown in dotted outline of Figure 1) to the flue connecting with the chimney.

What I claim as my invention is:

1. The combination of a substantially rectangular-casing containing a combustion chamber, a rectangular radiator casing arranged at one side parallel to and spaced from said combustion chamber casing, connections for passing the gaseous products of combustion from the combustion chamber to the upper portion of said radiator downward therethrough and outward from the lower portion thereof to the chimney connection, a jacket surrounding said furnace casing and radiator and spaced therefrom, a cold air entrance opening in the upper portion of said jacket adjacent to the outer wall of the radiator, a baffle extending through said jacket separating the space therein adjacent the outer walls of said radiator from the space between the inner wall of said radiator and combustion chamber casing, said baffle being in the plane of the inner wall of said radiator for the greater portion of the height of said radiator and forming a continuation of the inner wall of said radiator said baflie terminating above the base to connect said spaces at the lower ends thereof, and air propelling means in the upper portion of said furnace for drawing the air towards the same, thereby causing the air entering said opening to pass downward through said outer chamber then upward through said inner chamber and then outward to the points of distribution.

2. The combination of a substantially rectangular casing containing a combustion chamber, a rectangular radiator casing arranged at one side parallel to and spaced from said combustion chamber casing, connections for passing the gaseous products of combustion from the combustion chamber to the upper portion of said radiator downward therethrough and outward from the lower portion thereof to the chimney connection, a jacket surrounding said furnace casing and radiator and spaced therefrom, a cold air entrance opening in the upper portion of said jacket adjacent to the outer wall of the radiator, a baflle extending through said jacket in the plane of the inner wall of said radiator separating the space between the inner wall of said radiator and combustion chamber casing from the space surrounding the outer walls of said radiator, said baflle terminating above the base to connect the lower portions of said chambers with each other, and air propelling means in the upper portion of saidfurnace for drawing air towards the same thereby causing the air entering said opening to pass downward through the outer chamber then upward through the inner chamber and then outward to the points of distribution.

3. The combination of a substantially rectangular casing containing a combustion chamber, a rectangular radiator casing arranged at one side parallel to and spaced from said combustion chamber casing, connections for passing the gaseous products of combustion from the combustion chamber to the upper portion of said radiator downward therethrough and a smoke pipe extending laterally from the bottom of said radiator casing to the chimney connection, a jacket surrounding said furnace casing and radiator and spaced therefrom, a cold air entrance opening in the upper portion of said jacket adjacent to the outer wall of the radiator, a bafile extending through said jacket the upper portion thereof being in the plane of the inner wall of said radiator and the lower end portion extending outward over said smoke pipe into the plane of the outer wall of said radiator, said baifle separating the space between the inner wall of said radiator and combustion chamber casing from the space surrounding the outer walls of said radiator and terminating above the base to connect the lower portions of said chambers with each other, and air propelling means in the upper portion of said furnace for drawing the air towards the same thereby causing the air entering said opening to pass downward through said outer chamber then upward through the inner chamber and in contact with said smoke pipe and then outward to the points of distribution.

4. The combination of a substantially rectangular casing containing a combustion chamber,

a rectangular radiator casing arranged at one side parallel to and spaced from said combustion chamber casing, connections for passing the gaseous products of combustion from the combustion chamber to the upper portion of said radiator downward therethrough and outward from the lower portion thereof to the chimney connection, a jacket surrounding said furnace casing and radiator and spaced therefrom, a cold air entrance opening in the upper portion of said jacket adjacent to the outer wall of the radiator, a bafile extending through said jacket in the plane of the inner wall of said radiator separating the space between the inner wall of said radiator and combustion chamber casing from the space surrounding the outer walls of said radiator, said baffle terminating above the base to connect the lower portions of said chambers with each other, a filter extending obliquely across the space between the outer wall of said jacket and said baflle, an air washer in the space surrounding the outer wall of said bafile adjacent the lower end thereof and air propelling means in the upper portion of said furnace for drawing the air towards the same thereby causing the air entering said entrance opening to pass through said filter downward through the outer chamber and air washer then upward through the inner chamber and then outward to the points of distribution,

5. The combination of a substantially rectangular casing containing a combustion chamber, a pair of rectangular radiator casings arranged at each side parallel to and spaced from said combustion chamber casing, conduits from the top of said combustion chamber to the tops of said radiator casings, a smoke pipe extending laterally from each of said radiator casings at the bottom thereof, a jacket surrounding said furnace casing and radiators and spaced therefrom, cold air entrance openings in the upper portions of said jacket adjacent to the outer walls of said radiators, a pair of baffles extending through said jacket in the planes of the respective inner walls of said radiators, each baffle separating the space between the inner wall of said radiator and combustion chamber casing from the space surrounding the outer walls of said radiator, said baflle having a portion extending outwardly over said smoke pipe and downwardly in the plane of the outer wall of said radiator and terminating above the base to connect the lower portions of said chambers with each other, a fan at the top of the furnace for drawing the heated air through said air spaces whereby said bafile causes the cold air from said entrances to pass downwardly over the secondary heating surfaces of said radiators and upwardly in contact with said smoke pipes, the inner Walls of said radiators and the walls of said combustion chamber.

6. The combination of a substantially rectangular casing containing the combustion chamber, a jacket surrounding said casing and having a portion substantially parallel to a wall thereof and with a cold air entrance near its upper end, a partition extending between said casing and parallel portion of the jacket, a rectangular radiator having its inner wall formed by a portion of said partition and extending outward therefrom, connections for passing the gaseous products of combustion from said combustion chamber to the upper portion of said radiator downward therethrou-gh and outward from the lower portion thereof to the chimney connection, and air propelling means located above said casing for caussaid partition.

ERNEST I. DAIL. 

